Why do some explanations to questions take longer than others?

In order to ensure that students always receive the highest quality help from tutors, we’ve implemented a quality assurance step in the tutoring process. This step serves to ensure that all submitted questions go through a standard quality check to make sure they’re ready to receive high-quality explanations from tutors. With this quality check, a single question can be sent back to students for revisions up to 3 times. Although this back-and-forth may increase response times from tutors, it also increases the likelihood that the question is clearly understood by tutors, thereby allowing students to receive the most helpful and highest quality explanations possible.